Get a value off a web page

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VB

Good day all.

The below url has summary data for 2012 12 30
http://howickweather.info/summaries/day.php?d=20121230


I am trying to get the Mean temperature and Windrun using the below.
The problem is I only get

+ ''
+ 'Mean temperature'
+ '' + getVal("meanTemp", 1) + '°C '
+ 'Windrun'
+ '' + getVal("windrun", 1) + ' km '
+ ''
+ ''

not the actual values ( yet they show on the web page )

Any help greatly appreciated - I've spent hours trying to resolve. Thanks Ian.

Imports System.Net
Imports System.IO
Imports System.Xml
Imports System.Text
Imports System.Diagnostics


Public Class Form1
Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
Call main()
End Sub

Sub main()
Const URLString As String = "http://howickweather.info/summaries/day.php?d=20121230"

Dim SourceRequest As Net.HttpWebRequest = Net.HttpWebRequest.Create(URLString)
Dim SourceResponse As Net.HttpWebResponse = SourceRequest.GetResponse()
Dim SourceStream As New IO.StreamReader(SourceResponse.GetResponseStream)
Dim SourceCode As String = String.Empty

While SourceStream.EndOfStream = False
SourceCode &= vbNewLine & SourceStream.ReadLine
End While

SourceCode = SourceCode.Trim(vbNewLine)
RichTextBox1.Text = SourceCode

End Sub

End Class